ceph/src/librbd/mirror/PromoteRequest.cc

   1 // -*- mode:C++; tab-width:8; c-basic-offset:2; indent-tabs-mode:t -*-
   2 // vim: ts=8 sw=2 smarttab
   3
   4 #include "librbd/mirror/PromoteRequest.h"
   5 #include "common/dout.h"
   6 #include "common/errno.h"
   7 #include "cls/rbd/cls_rbd_client.h"
   8 #include "librbd/ImageCtx.h"
   9 #include "librbd/ImageState.h"
  10 #include "librbd/Journal.h"
  11 #include "librbd/Utils.h"
  12 #include "librbd/mirror/GetInfoRequest.h"
  13 #include "librbd/mirror/snapshot/PromoteRequest.h"
  14
  15 #define dout_subsys ceph_subsys_rbd
  16 #undef dout_prefix
  17 #define dout_prefix *_dout << "librbd::mirror::PromoteRequest: " << this \
  18                            << " " << __func__ << ": "
  19
  20 namespace librbd {
  21 namespace mirror {
  22
  23 using librbd::util::create_context_callback;
  24
  25 template <typename I>
  26 void PromoteRequest<I>::send() {
  27   get_info();
  28 }
  29
  30 template <typename I>
  31 void PromoteRequest<I>::get_info() {
  32   CephContext *cct = m_image_ctx.cct;
  33   ldout(cct, 20) << dendl;
  34
  35   auto ctx = create_context_callback<
  36     PromoteRequest<I>, &PromoteRequest<I>::handle_get_info>(this);
  37   auto req = GetInfoRequest<I>::create(m_image_ctx, &m_mirror_image,
  38                                        &m_promotion_state,
  39                                        &m_primary_mirror_uuid, ctx);
  40   req->send();
  41 }
  42
  43 template <typename I>
  44 void PromoteRequest<I>::handle_get_info(int r) {
  45   CephContext *cct = m_image_ctx.cct;
  46   ldout(cct, 20) << "r=" << r << dendl;
  47
  48   if (r < 0) {
  49     lderr(cct) << "failed to retrieve mirroring state: " << cpp_strerror(r)
  50                << dendl;
  51     finish(r);
  52     return;
  53   } else if (m_mirror_image.state != cls::rbd::MIRROR_IMAGE_STATE_ENABLED) {
  54     lderr(cct) << "mirroring is not currently enabled" << dendl;
  55     finish(-EINVAL);
  56     return;
  57   } else if (m_promotion_state == PROMOTION_STATE_PRIMARY) {
  58     lderr(cct) << "image is already primary" << dendl;
  59     finish(-EINVAL);
  60     return;
  61   } else if (m_promotion_state == PROMOTION_STATE_NON_PRIMARY && !m_force) {
  62     lderr(cct) << "image is still primary within a remote cluster" << dendl;
  63     finish(-EBUSY);
  64     return;
  65   }
  66
  67   promote();
  68 }
  69
  70 template <typename I>
  71 void PromoteRequest<I>::promote() {
  72   CephContext *cct = m_image_ctx.cct;
  73   ldout(cct, 20) << dendl;
  74
  75   auto ctx = create_context_callback<
  76     PromoteRequest<I>, &PromoteRequest<I>::handle_promote>(this);
  77   if (m_mirror_image.mode == cls::rbd::MIRROR_IMAGE_MODE_JOURNAL) {
  78     Journal<I>::promote(&m_image_ctx, ctx);
  79   } else if (m_mirror_image.mode == cls::rbd::MIRROR_IMAGE_MODE_SNAPSHOT) {
  80     auto req = mirror::snapshot::PromoteRequest<I>::create(
  81       &m_image_ctx, m_mirror_image.global_image_id, ctx);
  82     req->send();
  83   } else {
  84     lderr(cct) << "unknown image mirror mode: " << m_mirror_image.mode << dendl;
  85     finish(-EOPNOTSUPP);
  86   }
  87 }
  88
  89 template <typename I>
  90 void PromoteRequest<I>::handle_promote(int r) {
  91   CephContext *cct = m_image_ctx.cct;
  92   ldout(cct, 20) << "r=" << r << dendl;
  93
  94   if (r < 0) {
  95     lderr(cct) << "failed to promote image: " << cpp_strerror(r)
  96                << dendl;
  97   }
  98
  99   finish(r);
 100 }
 101
 102 template <typename I>
 103 void PromoteRequest<I>::finish(int r) {
 104   CephContext *cct = m_image_ctx.cct;
 105   ldout(cct, 20) << "r=" << r << dendl;
 106
 107   m_on_finish->complete(r);
 108   delete this;
 109 }
 110
 111 } // namespace mirror
 112 } // namespace librbd
 113
 114 template class librbd::mirror::PromoteRequest<librbd::ImageCtx>;